Answer:
Cr⁺² = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d²
Explanation:
As Chromium atom has 24 electrons in its shells. When it lose 2 electrons from its valance shell, it become chromium ion. Thus chromium ion has 22 electrons.
Fill electrons in shells accordingly.
